You have an RGB image that you want to convert to a duotone, but in the image > Mode menu, the Duotone option in grayed out. Why is this happening?

  • You must add a spot color channel first
  • You must remove all existing color by Image > Adjustments > Desaturate first
  • Duotones require a single channel, so you must convert to grayscale first
  • Duotones require two channels, so you must delete one of RGB channels in the Channels panel first
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